dnxhddec: return proper error code

Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>

libavcodec/dnxhddec.c

@@ -70,7 +70,7 @@ static int dnxhd_init_vlc(DNXHDContext *ctx, int cid)
 
         if ((index = ff_dnxhd_get_cid_table(cid)) < 0) {
             av_log(ctx->avctx, AV_LOG_ERROR, "unsupported cid %d\n", cid);
-            return -1;
+            return AVERROR(ENOSYS);
         }
         ctx->cid_table = &ff_dnxhd_cid_table[index];
 
@@ -98,14 +98,14 @@ static int dnxhd_decode_header(DNXHDContext *ctx, AVFrame *frame,
                                const uint8_t *buf, int buf_size, int first_field)
 {
     static const uint8_t header_prefix[] = { 0x00, 0x00, 0x02, 0x80, 0x01 };
-    int i, cid;
+    int i, cid, ret;
 
     if (buf_size < 0x280)
-        return -1;
+        return AVERROR_INVALIDDATA;
 
     if (memcmp(buf, header_prefix, 5)) {
         av_log(ctx->avctx, AV_LOG_ERROR, "error in header\n");
-        return -1;
+        return AVERROR_INVALIDDATA;
     }
     if (buf[5] & 2) { /* interlaced */
         ctx->cur_field = buf[5] & 1;
@@ -140,12 +140,12 @@ static int dnxhd_decode_header(DNXHDContext *ctx, AVFrame *frame,
     cid = AV_RB32(buf + 0x28);
     av_dlog(ctx->avctx, "compression id %d\n", cid);
 
-    if (dnxhd_init_vlc(ctx, cid) < 0)
-        return -1;
+    if ((ret = dnxhd_init_vlc(ctx, cid)) < 0)
+        return ret;
 
     if (buf_size < ctx->cid_table->coding_unit_size) {
         av_log(ctx->avctx, AV_LOG_ERROR, "incorrect frame size\n");
-        return -1;
+        return AVERROR_INVALIDDATA;
     }
 
     ctx->mb_width = ctx->width>>4;
@@ -159,7 +159,7 @@ static int dnxhd_decode_header(DNXHDContext *ctx, AVFrame *frame,
     if (ctx->mb_height > 68 ||
         (ctx->mb_height << frame->interlaced_frame) > (ctx->height+15)>>4) {
         av_log(ctx->avctx, AV_LOG_ERROR, "mb height too big: %d\n", ctx->mb_height);
-        return -1;
+        return AVERROR_INVALIDDATA;
     }
 
     for (i = 0; i < ctx->mb_height; i++) {
@@ -167,7 +167,7 @@ static int dnxhd_decode_header(DNXHDContext *ctx, AVFrame *frame,
         av_dlog(ctx->avctx, "mb scan index %d\n", ctx->mb_scan_index[i]);
         if (buf_size < ctx->mb_scan_index[i] + 0x280) {
             av_log(ctx->avctx, AV_LOG_ERROR, "invalid mb scan index\n");
-            return -1;
+            return AVERROR_INVALIDDATA;
         }
     }
 
@@ -338,8 +338,8 @@ static int dnxhd_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
     av_dlog(avctx, "frame size %d\n", buf_size);
 
  decode_coding_unit:
-    if (dnxhd_decode_header(ctx, picture, buf, buf_size, first_field) < 0)
-        return -1;
+    if ((ret = dnxhd_decode_header(ctx, picture, buf, buf_size, first_field)) < 0)
+        return ret;
 
     if ((avctx->width || avctx->height) &&
         (ctx->width != avctx->width || ctx->height != avctx->height)) {